docs: def pop_value(instance, path, ref=None):
      """
      Pop the value from `instance` at the given `path`.
  
      Parameters
      ----------
      instance : dict or list
          instance from which to retrieve a value
      path : str
          path to retrieve a value from
      ref : str or None
          reference path if `path` is relative
  
      Returns
      -------
      value :
          value at `path` in `instance`
      """
      head, tail = os.path.split(abspath(path, ref))
      instance = get_value(instance, head)
      if isinstance(instance, list):
          tail = int(tail)
      return instance.pop(tail)